Unnamed (near Cheeneetnuk River)

Occurrence in Alaska, United States with commodities Copper, Silver

Geologic information

Identification information

Deposit ID 10307836
Record type Site
Current site name Unnamed (near Cheeneetnuk River)

Geographic coordinates

Geographic coordinates: -155.12284, 62.06545 (WGS84)
Relative position The unnamed occurrence is located on a steep east-facing slope overlooking Cheeneetnuk River, at an elevation of 1,400 feet (427 m) in the southern half of sec. 22, T. 23 N., R. 32 W., of the Seward Meridian. The occurrence corresponds to map number 120 of Gilbert (1981); his station no. 77WG5.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary

Materials information

Materials Type of material
Pyrite Ore

Mineral occurrence model information

Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Nearby scientific data

(1) -155.12284, 62.06545

Comments on the geologic information

  • Geologic Description = This unnamed occurrence is a mineralized, pyritic argillite near the contact between Middle Devonian limestone and upper Paleozoic argillite, both subdivisions of the Mystic subterrane (Gilbert, 1981; Wilson and others, 1998). The argilite appears to be thermally upgraded to hornfels; a mid-Tertiary granite pluton is exposed about one mile west of the occurrence. One grab sample contained 178 ppm copper and 0.7 grams/tonne silver (Gilbert, 1981).

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = W.G. Gilbert found the mineral zone during a geologic mapping project for the Alaska Division of Geological and Geophysical Surveys in 1977 (Gilbert, 1981). One grab sample contained 178 ppm copper and 0.7 grams/tonne silver.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MG020

Bibliographic references

  • Deposit

    Gilbert, W.G., 1981, Preliminary geologic map of the Cheeneetnuk River area, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report 153, 19 pages, 2 sheets, 1:63,360 scale.

  • Deposit

    Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 17 p., 2 sheetsm, scale 1:500,000.

Comments on the references

  • Primary Reference = Gilbert, 1981

General comments

Subject category Comment text
Deposit Model Name = Polymetallic replacement (?) (Cox and Singer, 1986; model 19a).

Reporter information

Type Date Name Affiliation Comment
Reporter 10-DEC-98 T.K. Bundtzen Pacific Rim Geological Consulting